<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<style type="text/css">
			.red{
				color: red;
			}
			.underline{
				text-decoration: underline;
			}
			.big-font{
				font-size: 50px;
			}
		</style>
	</head>
	<body>
		<p class="big-font red">段落1</p>
		<p class="underline red">段落2</p>
		<p class="big-font underline">段落3</p>
		<p class="underline red big-font">段落4</p>
	</body>
</html>
